AdMob Inc. was approached by AppleInc. about an acquisition before the company agreed to a$750 million offer from Google Inc., according to peoplefamiliar with the matter.

Apple contacted AdMob a few weeks before Google made itsbid, said one of the people, who declined to be identifiedbecause the negotiations weren’t public. AdMob, based in SanMateo, California, sells ads that appear on mobile phones.